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    <h1>第一章</h1>
    <p><a href="改变网页背景颜色.html">第一题：改变网页颜色</a></p>
    <p><a href="验证用户输入的密码.html">第二题：验证用户输入的密码</a></p>
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    <p><a href="第二章.html">下一章</a></p>
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